In modern power grids operated by organizations such as National Grid and State Grid Corporation of China, glass insulators must maintain electrical integrity under heavy mechanical load, pollution stress, wind vibration, and temperature fluctuation.
Our glass disc suspension insulators are designed to:
Withstand high tensile and compressive mechanical loads
Maintain stable dielectric performance under pollution conditions
Provide consistent creepage distance for long-term reliability
Operate safely in 33kV–500kV transmission systems
The modular disc structure allows utilities and EPC contractors to configure strings according to specific voltage class and insulation coordination requirements.
The cap and pin type suspension insulator consists of:
Toughened low-alkali glass dielectric unit
Hot-dip galvanized forged steel cap
Zinc-coated forged steel pin
Stainless steel locking device
The ball-and-socket connection enables:
Quick string assembly on site
Flexible articulation under conductor swing
Reduced stress concentration during wind or short-circuit events
For EPC contractors handling transmission line construction, this design shortens installation time and improves field efficiency.
Compared with porcelain alternatives, toughened glass offers:
If internal defects occur, the glass unit shatters visibly while remaining mechanically locked in the string. This makes line inspection faster and more reliable for maintenance teams.
The tempering process increases impact resistance and tensile capacity, suitable for heavy conductor loads and long-span transmission towers.
Low-alkali glass ensures consistent dielectric strength and long-term aging resistance.
These characteristics make glass disc suspension insulators particularly suitable for:
National grid expansion projects
Cross-border transmission corridors
Wind and solar farm grid connection lines
Rural electrification programs
For power utilities and transmission EPC firms, supply reliability is as critical as product quality.
Electric Powertek provides:
Stable bulk production capacity
Strict dimensional consistency for string interchangeability
Full routine and type test reports
Compliance with IEC and relevant international standards
Corrosion-resistant hot-dip galvanizing
Our manufacturing process includes cementing with controlled thermal curing to ensure long-term bonding stability between metal fittings and glass dielectric.
Typical applications include:
69kV transmission lines
132kV transmission networks
220kV and above overhead systems
Heavy pollution industrial zones
Coastal and desert regions
Disc units can be assembled into strings based on insulation coordination design requirements.
In transmission projects executed by major EPC contractors such as Power Construction Corporation of China and global energy solution providers like Siemens Energy, suspension insulators must integrate seamlessly with:
Suspension clamps
Strain clamps
Vibration dampers
Armor rods
Cross arms and galvanized fittings
Electric Powertek insulators are dimensionally compatible with international hardware systems, ensuring smooth integration into complete overhead line assemblies.
Each production batch undergoes:
Mechanical tensile testing
Routine electrical withstand testing
Galvanization thickness inspection
Visual quality control
Products can be supplied with documentation supporting compliance with:
IEC standards
ISO quality management systems
CE certification (if required by destination market)
For importers and regional distributors, complete export documentation and packaging customization are available.
Integrated R&D and manufacturing facility
Experience serving markets in North America, Middle East, Africa, and Europe
One-stop supply of insulators and transmission line fittings
Bulk shipment capability for project-scale orders
Technical support for transmission line configuration
Whether supporting national grid expansion or rural distribution upgrades, our glass disc suspension insulators deliver mechanical reliability, electrical safety, and installation efficiency.
INSULATORS COMPONENTS
Cap and pin type of suspension glass insulator consists of the following elements: insulating part (or dielectric), pin, cap and locking device.
A locking device is a part of insulator for fixation and is manufactured of stainless steel. The assembling of an insulator is performed by cement-send mix followed by thermal wet treatment. The assembling may be performed with Portland cement or aluminosilicate cement.
A cap is for movable fixation of an insulator to another one or fittings. Caps are produced by casting from high-strength cast iron or malleable cast iron.They are made in the method of hot-dip galvanizing method to ensure its corrosion-resistant property.
Caps for DC insulators are equipped with a collar made by casting.
The insulating part is manufactured by the compaction method from low-alkali glass followed by toughening.
TECHNICAL PARAMETER
Glass insulators are a crucial component in the insulation and support of overhead transmission lines. In the early years, insulators were primarily used on power poles. However, their usages evolve to include high-voltage power line connection towers, where multiple disc-shaped insulators are hung at one end to increase the creepage distance. These insulators are commonly made of glass and are vital for maintaining insulation in power transmission systems.
ADVANTAGES OF GLASS INSULATOR
Raw Material:
Made of tempered(toughened)glass, which is more stable compared to materials used for porcelain insulators.
Suitable for various weather conditions; waterproof and moisture-proof.
Able to function normally in rainy or humid environments.
Appearance:
Glass transparency makes it easier to detect small cracks, internal defects, or damages during visual inspections.
Performance:
Excellent insulation performance and reliable operation.
High hardness, resistance to bending, and effective anti-fouling properties.
Strong mechanical and electrical performance, small size, lightweight, and long service life.
Mechanical Strength:
High mechanical strength, especially on the surface, which is resistant to cracks and slow aging.
Ease of Testing:
Preventive testing can be minimized since any damage to the glass is easily detectable during line inspections, allowing operators to identify problems visually.
Self-Cleaning Properties:
Glass insulators have smooth surfaces, which reduce the accumulation of dirt, dust, and pollutants, especially in outdoor environments. Rainwater naturally helps clean the surface, maintaining performance.
Resistant to Weathering:
Glass insulators have excellent resistance to UV radiation and other environmental factors, maintaining their strength and transparency over time without degradation.
Thermal Stability:
Glass has good thermal properties, meaning it can withstand extreme temperature variations without cracking or losing insulation properties.
Resistance to Corrosion:
Glass is highly resistant to corrosion, especially in harsh industrial or coastal environments, unlike metal components that can degrade due to chemical exposure.
Safety Factor:
In case of damage, glass insulators tend to shatter into small, blunt pieces rather than large, sharp shards. This makes them safer to handle and reduces the risk of injury during maintenance or replacement.
Environmental Friendliness:
Glass is a recyclable material, and glass insulators have a lower environmental impact in terms of disposal compared to other materials like plastics or certain ceramics.
Long-Term Cost Efficiency:
Due to their long service life and reduced need for regular preventive testing or cleaning, glass insulators can offer lower maintenance costs over time compared to other insulator types.
Application
Testing
Packing&Delivery
Cooperative Client
Our cooperative client are all over the world and our products are very popular all over the world. Many products are exported to Russia, USA, Australia, Canada, South Africa, Kenya, Tanzania, Zambia, Brazil and Argentina. Chile, Southeast Asian countries and other international markets. With first-class technical ability and perfect pre-sale and after-sales service guarantee system, we have established a good reputation between enterprises and users.
FAQ
Q: Do you provide sample service?
A: Yes, we only provide samples and ask for one piece at a time. The freight should be borne by you.
Q: Do you support customized services？
A: Yes, we can customize the size and logo according to your needs. Please consult the customer service for the specific minimum order quantity.
Q: How is the Design & Engineering?
A: Experienced and skilled team of designers including CAD designers and 3D designers has the capacity to deliver outstanding designs for your project. If you require more complex engineering of structures such as overhead transmission and distribution lines design,we can also provide this service also designer fee .
Q: What's the payment term?
A: We accept T/T, L/C, West Union.
Q: What's the delivery time?
A: Usually within 7-15 days according to quantities
Q: What's the standard of package?
A: Export standard package or special package as the requirement of customers.
Q: What kind of product quality your factory offer?
A: Our products with both excellent quality and competitive price. And we offer free sample for your reference.
Q: What kind of certificate you have?
A: We have ISO9001:2008
